全屏Dialog實現，佈局可擴展到狀態欄和導航欄

話不多說一看就懂，網上的大部分實現都沒效果，用這個就對了

public class FullScreenDialog extends Dialog {
    private View view;

    public FullScreenDialog(@NonNull Context context, View view) {
        super(context);
        this.view = view;
    }

    public FullScreenDialog(@NonNull Context context, int themeResId, View view) {
        super(context, themeResId);
        this.view = view;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        requestWindowFeature(Window.FEATURE_NO_TITLE);

        setContentView(view);

        //按空白處不能取消
        setCanceledOnTouchOutside(false);
        Window window = getWindow();
        View decorView = window.getDecorView();
        //設置window背景，默認的背景會有Padding值，不能全屏。當然不一定要是透明，你可以設置其他背景，替換默認的背景即可。
        window.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));

        //兩個 flag 要結合使用，表示讓應用的主體內容佔用系統狀態欄的空間
        int option = View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_STABLE;
        decorView.setSystemUiVisibility(option);
        window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
        window.setStatusBarColor(Color.TRANSPARENT);
        //設置導航欄顏
        window.setNavigationBarColor(Color.TRANSPARENT);
        //內容擴展到導航欄
        window.setType(WindowManager.LayoutParams.TYPE_APPLICATION_PANEL);

    }

這麼用->

View view = LayoutInflater.from(context).inflate(R.layout.dialog_face_check, null);


Dialog dialog = new FullScreenDialog(activity,
                android.R.style.Theme_DeviceDefault_Light_NoActionBar, view);
dialog.setCancelable(true);
dialog.setOnCancelListener(dialog1 -> {

});
dialog.show();